Measurements of ultraviolet solar spectral irradiance from ground-based observations made a Reykjavik (64oN) and Thessaloniki (40oN) are used to calculate erythemally-weighted UV-B dose during EASOE. It is shown that the largest values of UV-B dose observed were about double those expected with an uperturbed ozone amount under cloudy conditions. At middle latitudes UV-B doses were within expectation throughout the period of the campaign.